Most people I talk to highly frown upon keeping goldfish in water that's above 20C, so I'm curious what you guys have to say.
Do you consider goldfish coldwater only fish?
- Thread starter fishdat
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When I do keep them I simply don't heat their tank.That's as far as I go in terms of worrying about the temperature.
goldfsh are tanks that can thrve n most any temperature. lots of people keep them n tropcal waters
A common mistake is to lump ALL species of goldfish into the same category. Most of the fancy species show their best growth, and color, in tropical temps. Many of the expert champion breeders raise the fancy breeds such as Ranchu, Lionhead, Oranda, etc at approx 78-80F. (at least for the first year)
Most goldfish will tolerate wide ranges in temperature, but any changes, either up or down, should be gradual.
Most goldfish will tolerate wide ranges in temperature, but any changes, either up or down, should be gradual.
TBH, I don't know the different temp for each goldfish species, I knew they can survive outside pond through winter (East Coast Winter), and as usual RD always have very informative answer 
I don't consider them a coldwater-only fish, but I do consider them a fish that does best in a species-specific tank, and generally when people keep them in tropical setups, it's because they want to keep goldfish along with tropical species.
The sheer amount of waste that large cyprinids produce, as a heavy-bodied fish that spends most of its time grazing, makes them unsuitable for community tanks, IMO... I know carp, for instance, remind me of big aquatic cows. They just eat and poop and churn up the bottom.
The sheer amount of waste that large cyprinids produce, as a heavy-bodied fish that spends most of its time grazing, makes them unsuitable for community tanks, IMO... I know carp, for instance, remind me of big aquatic cows. They just eat and poop and churn up the bottom.
If were going to get specific about it the common goldfish Carassius auratus is classified as a "cold water fish". Which can not tolerate temps over 80 degrees for extended periods of time, but are comfortable in temps between 50 to 72 degrees. Making them perfect for ambient household temperatures, unheated tanks and outdoor ponds that don't freeze solid during the winter. Even other fancy strains that can't tolerate wintering over out doors would still be classed as a cold water fish, none would be considered tropical in the broad sense of the definition.
They are classified as a cold water fish but look at the all the sub tropical environments they(the non fancy breeds) have been able to colonize in the wild, due to aquarium/bait releases.
Common/comet goldfish handled 80+°F just fine. Few natural ponds do get hot during summer months, but seldom we see a summer kill of goldfish. All strains will do just fine in unheated aquariums and the fantails will survive the same cold temperatures of common goldfish